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相对于基牙和无牙区倒凹的评估:一项回顾性横断面研究。

Assessment of Undercuts Relative to Abutment Teeth and Edentulous Area: A Retrospective Cross-sectional Study.

作者信息

Sayed Mohammed, Jameel Ahmad, Duhduh Ghadi, Arishi Tasneem, Alqadi Aziza, Jain Saurabh

机构信息

Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Kingdom of Saudi Arabia.

College of Dentistry, Jazan University, Jazan, Kingdom of Saudi Arabia.

出版信息

J Contemp Dent Pract. 2020 Jan 1;21(1):41-46.

Abstract

AIM

Undercuts on abutment teeth (AT) should be identified and quantified to establish the exact location of the active tip of the retentive arm of the direct retainer. The aim of this study was to locate and evaluate tissue and tooth undercut areas in various Kennedy's classes and to assess the correlation, if any, between Kennedy's classes and the location and depth of undercuts.

MATERIALS AND METHODS

One hundred and seven patients' casts, with designated AT and edentulous areas (EAs), were surveyed. The undercuts on AT and EAs were measured using undercut gauges. Statistical analysis was performed.

RESULTS

The median depth of the undercut was maximum on distal the surface of mandibular AT in a Kennedy's class III edentulous situation. No significant difference was found between the amount of tissue undercuts measured on the EA in each of the Kennedy's classes in the maxillary and mandibular arches.

CONCLUSION

No significant difference was found between the amounts of undercut measured on AT and the EA in each of the Kennedy's classes in the maxillary and mandibular arches. No correlation was found between Kennedy's classes and the location and depth of undercuts.

CLINICAL SIGNIFICANCE

The results of our study reinforce that the diagnosis and selection of ideal abutments should be stressed while planning for a removable dental prosthesis (RDP). In the majority of the cases, the anticipated design of the direct retainer can be applied, though one cannot overlook the need for proper diagnosis and survey.

摘要

目的

应识别并量化基牙上的倒凹,以确定直接固位体固位臂活动尖端的确切位置。本研究的目的是确定并评估不同肯氏分类中组织和牙齿的倒凹区域,并评估肯氏分类与倒凹位置和深度之间是否存在相关性。

材料与方法

对107例有指定基牙和无牙区的患者模型进行测绘。使用倒凹测量仪测量基牙和无牙区的倒凹。进行统计学分析。

结果

在肯氏Ⅲ类无牙情况下,下颌基牙远中面的倒凹深度中位数最大。在上颌和下颌弓的每个肯氏分类中,无牙区测量的组织倒凹量之间未发现显著差异。

结论

在上颌和下颌弓的每个肯氏分类中,基牙和无牙区测量的倒凹量之间未发现显著差异。肯氏分类与倒凹位置和深度之间未发现相关性。

临床意义

我们的研究结果强化了在计划可摘局部义齿(RDP)时应强调理想基牙的诊断和选择。在大多数情况下,可以应用预期的直接固位体设计,尽管不能忽视正确诊断和测绘的必要性。

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